I think it is a great place worth spending time there. Chris is a very nice and friendly person, check-in and check-out were great!
Location: I think it is a nice quiet place to stay, and BTS Skytrain is in nearly, 5-10 minutes walk. Although I had to get used to walking through the maze of narrow streets between fences. Couple times taxi drivers refused to get me to the place because of narrow streets, although strictly speaking, that is not true, and cars can easily get to the building. Nearest cool street I think is Silom Road - it is very beautiful, lots of shopping, restaurants, coffee places, street food, massages, and so on. Takes about 15 minutes walking to get to Silom Road.
The room is nice and fresh. AC is powerful enough to cool down a room in minutes. Mattress is good, I had no problems sleeping on it. What I liked most is that there are so many separate tabletops for everything: cooking, working, eating, self-care and there is a spacious tabletop in the bathroom. Plenty of kitchen equipment: utensils, knives, pots, steamer, blender, toaster, all kinds of plates. It took me a few days to realize how many different helpful things there are in that kitchen!
In the bathroom I found a toothbrush, toothpaste, shower gel and shampoo, and a few bottles of water in a fridge - all that is super nice.
The only thing I think can make a room better is adding a daylight blocking blinds/curtain to a window. For those who wake up late, or sleep during the daytime, I think it is too much light, especially in the mornings.
In-building fitness center is very small, not much equipment there and it is very hot and humid inside, there is no AC so it barely can be used in the hot season, although it depends on your tolerance to high temperatures. I personally went for workouts to Cascade Fitness - it is a super nice fitness center in 10-15 minutes walk. One time admission is 600-700 THB (depends on where you buy, e.g. via fittripper.com is 600, walk-in, inside is ~650) they also gave me one time welcome admission for free.
Laundry: There are 2 washing machines in the building. Bring your own detergent. It is a coin laundry (30 THB for 10 kg load and 40 THB for 15 kg load, accepts 10 THB coins). Advice: a good way to get coins - is change from ticketing machines at any BTS skytrain station. Machines looked new, and I never saw it was busy. There are no dryers, so I used hangers on the in-room balcony to dry clothes. Iron and iron board is in the room if needed.